As part of one of those Free-App-A-Day programs, Moog's Filtatron is free right now!
FILTATRON is much more than your average sound app. It’s a phenomenal real-time audio effects suite and powerful studio tool for your iPhone or iPod Touch.
It’s not a toy, but go ahead and play with it.
The Moog Filtatron is a realtime audio filter and effects engine. Use sound from any of three sources:
• Line/microphone input,
• Built-in oscillator, or
• Import any song on your iDevice into the Sampler.
Run the sound through a virtual version of the famous Moog filter with a little (or a lot) of filter modulation, delay, and overdrive to create your own musical statement.
Multi-touch X-Y pads provide highly tweakable performance control for live use.
This was Moog's first app. Although it has been somewhat abandoned in the wake of Animoog, Moog has said that Audiobus would eventually be coming to Filtatron. There is no clue as to when that might be, but if you're getting this app free today you should give them all the time in the world to do so! Although Moog is a big name, they are also a relatively small company. The amount of the Moogers working on apps is pretty small and those guys have other responsibilities as well.
So grab it while you can, this sale will not last long!
Here is a demo of Filtatron with a modular synth, recorded on VHS back in 1989! The action starts about 3 minutes in.